slackito wrote: AFAICT for the bazel build we'd need to update this manually-ported clang/include/clang/Config/config.h: https://github.com/llvm/llvm-project/blob/main/utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h https://github.com/llvm/llvm-project/pull/157536